NAV 4 *Part I*
Navigational Astronomy Quiz
Test your knowledge on celestial navigation with our comprehensive quiz! Explore various terms and concepts related to the angular distances and movements of celestial bodies. Whether you're a student, teacher, or enthusiast, this quiz brings clarity to the fascinating world of navigation.
Key Features:
- Multiple choice questions
- Scores to track your performance
- Learn essential navigation terms
Which term refers to the angular distance between the First Point of Aries and the body measured eastward?
RA
SHA
LHA
GHA
Which term refers to the angular distance of a Celestial body North or South of Equinoctial?
Zenith distance
Polar Distance
Declination
Celestial Equator
Which term refers to the angular distance of a celestial body from the nearer pole ti the body measured by the arc of the Hour cycle?
Zenith distance
Polar distance
Declination
Celestial equator
The extension of the Earth’s Equator on all side towards the sky is called _____.
Celestial horizon
Celestial equator
Celestial axis
Declination
The angular distance measured easterly from the first point of Aries to the body is called _____.
SHA
GHA
LHA
Right Ascension
The small circle of the celestial sphere parallel to the celestial equator and transcribed as the daily motion of the body is called _____.
Altitude circle
Diurnal circle
Vertical circle
Hour circle
Which is the celestial pole above the horizon that agrees with the name of latitude?
Depressed pole
Nadir
Elevated pole
Zenith
The daily path of the sun is along the _____.
Equator
Parallel of latitude
Hour circle
Parallel of declination
Which great circle passes through the north and south celestial poles?
Hour circle
Vertical circle
Prime vertical circle
Principal vertical circle
The distance measured westward from the observer’s meridian to the Hour circle passing through the body is called _____.
GHA
LHA
SHA
Hour angle
Which angle at the pole between the meridian of Greenwich and the hour circle of the body?
GHA
LHA
SHA
Hour angle
Which angle at the pole between the meridian of Greenwich and the hour circle of the body?
SHA
GHA
LHA
SHA
Time Diagram is a diagram on the plane of the _____.
Celestial horizon
Celestial equator
Celestial meridian
Prime meridian
Where is the body when its LHA and Meridian angle are zero?
Celestial Horizon
Pn, Ps
Meridian Passage
Celestial Equator
Which is the daily path of a celestial body that is parallel to the celestial equator?
Altitude circle
Vertical circle
Hour circle
Diurnal circle
When the declination of celestial body is zero, which statement is TRUE when the observer is on the equator?
Length of daylight is longer than darkness.
Diurnal motion is along the prime vertical.
The azimuth of celestial body is constant.
Declination is equal to altitude.
LHA’s rate of change of 1 degree every 4 minutes is mainly caused by _____.
The revolution of earth around the sun
Maximum declination of 23.5 degrees
Change of altitude of the body
The rotation of the earth on its axis
The angular distance of a celestial body north or south of the celestial equator measured along the hour circle of the body is known as _____.
Declination
Polar distance
Zenith distance
Altitude
What is the rate of change of the hour angle of the mean Sun as observed from a stationary observer?
900 minutes of arc per hour
902.46 minutes of arc per hour
2.46 minutes of arc per hour
3.46 minutes of arc per hour
Which is the celestial pole above the horizon that agrees with the name of latitude?
Zenith
Depressed pole
Nadir
Elevated pole
The arc of the horizon, or the angle at the zenith, between the north part of the celestial meridian or principal vertical circle measured from 000 degree at the north part through 360 degrees is called _____.
Zenith
Elevated pole
First Point of Aries
Greenwich meridian
A Time Diagram is a diagram on the plane of the _____.
Celestial horizon
Celestial equator
Celestial meridian
Prime meridian
What is the rate of change of the SHA of the mean sun?
2.46 minutes of arc per hour
3.46 minutes of arc per hour
900 minutes of arc per hour
902.5 minutes of arc per hour
How do you calculate the GP of a celestial body of the GMT is known?
By the body’s declination and GHA
By the body’s declination and SHA
By the body’s zenith distance and GHA
By the body’s zenith distance and SHA
The apparent circular path which celestial bodies perform daily around the earth with celestial pole as the center is called ____.
Vertical circle
Prime vertical
Diurnal circle
Hour circle
Daylight is longer than darkness when _____.
Latitude and declination have the same name
Declination is at its maximum
Altitude is equal to zero
The altitude of the observer is zero
The side PX in the navigational triangle is called _____.
Co-latitude
Co-altitude
Co-declination
Co-azimuth
The declination of a body and your latitude has the same name and are numerically equal, which of the following is CORRECT?
At upper transit, the body is in your zenith.
At lower transit, the body is in your zenith.
The body crosses the Prime Vertical below the horizon.
The body is on the horizon nadir at lower transit.
The arc of hour circle between the celestial pole, usually the elevated pole and a point on the celestial shpere is called _____.
Zenith distance
Polar distance
Longlitude
Altitude
In latitude 10° North, the sun declination is 0°, what will be the approximate azimuth at the time of rising?
080°
090°
100°
110°
When would be the polar distance of a body equal to 90°?
The latitude of the observer is 00°
The latitude of the observer is 90°
The declination of the body is 00°
The latitude of the body is 90°
The angular distance of a celestial body N or S of the celestial equator measured along the hour circle of the body is known as _____.
Polar distance
Altitude
Zenith distance
Declination
The angle at the pole between the Greenwich celestial meridian and the hour circle of the body is called _____.
GHA
LHA
SHA
Meridian Angle
The angular distance measured westerly from the first point of Aries to the hour circle passing through the body is called _____.
GHA
LHA
SHA
RA
The angular distance measured easterly from the first point of Aries to the hour circlr of the body expressed in time is called _____.
GHA
LHA
SHA
RA
Which is the arc of the celestial equator or angle at the celestial pole between upper branch of the celstial meridian and the hour circle of the body measured either east or west trough 180°?
Meridian angle
Sidereal hour angle
Local hour angle
Greenwich hour angle
The small circle of the celestial sphere parallel to the celestial equator and transcribed the daily motion of the body is the _____.
Vertical circle
Hour circle
Diurnal circle
Altitude circle
Which great circle that is always needed to from the astronomical triangle?
Celestial equator
Longitude
Celestial meridian
Prime vertical circle
Where is the body if the LHA is 180°?
Upper Transit
Lower transit
Prime vertical circle
PnPs line
Where is the body if LHA is 360°?
Upper Transit
Lower transit
Prime vertical circle
PnPs line
A great circle in the celestial sphere which has its plane perpendicular to the celestial poles is called _____.
Celestial Pole
Right Ascension
Celestial Eqautor
Celestial Meridian
The two opposite points of the celestial sphere where it is piereced by the earth’s axis is called ____.
Celestial Pole
Right Ascension
Celestial Equator
Celestial Meridian
The distance measured west ward from the hour circle of Aries to the hour circle of the body from 0° to 360° is called _____.
Celestial Pole
Right Ascension
Celestial Equator
Sidereal Hour Angle
A great circle of the celestial sphere, through the celestial poles and the zenith is called _____.
Celestial Pole
Right Ascension
Celestial Meridian
Celestial Equator
What is the LMT if he LHA of the sun is 180 degrees?
1200H
0900H
0600H
0000H
What is known as the part of the parallel of declination which is apparently described between the times of setting to the time of rising of heavenly bodies?
Diurnal arc
Polar distance
Nocturnal arc
Altitude circle
Which is the angular distance measured eastward from the vernal equinox of the body and expressed in time unit?
Right ascension
Meridian Angle
Sidereal Hour Angle
Local Hour Angle
What is the angle measured along the celstial equator from vernal equinox westward to the hour circle passing through the body from 0 deg to 360 deg?
Right ascension
Meridian angle
Local hour angle
Sidereal hour angle
What is known as the angular distance of a celestial body N or S of the celstial equator measured along the hour circle of the body?
Altitude
Zenith distance
Polar distance
Declination
What is the arc of the equinoctial system of coordinates which is contained between the hour circle of Aries measured westward to the hour circle of the body?
Right Ascension
Local Hour Angle
Greenwich Hour Angle
Sidereal Hour Angle
What is the conventional representation of the sky as a spherical shell on which the celestial bodies appear projected?
Celestial Equator
Celestial Horizon
Celestial Sphere
Celestial Meridian
What is longlitude of the geographical position of a body whose Greenwich hour angle is 210°30’?
30°30’ E
59°30’ W
149°30’ E
149°30’ W
The sun’s true altitude at meridian passage was 61° 25’S, the sun declination is 16° 23’N. What is the latitude of the observer?
44° 58’N
44° 58’S
28° 35’N
28° 35’S
The navigator observed the planet Venus at 90° altitude, declination is 22° 37.6’ N and the GHA is 208° 14.3’. Compute its longitude.
151° 45.7 E
151° 54.7 E
151° 46.0 E
151° 46.0 W
The navigator observed the planet venus at 90° altitude, declination is 22° 37.6’ N and the GHA is 208° 14.3’. Compute the latitude of the observer.
22° 37.8’N
22° 37.6’N
67° 22.4’N
67° 22.8’N
_____ is an angular distance the horizon measured along the vertical to the body from 0° to 90° at the zenith.
Altitude
Parallel of altitude
Approximate altitude
Rational horizon
_____ is a circle of the celestial sphere parallel to the horizon, connecting all points of equal altitude.
Altitude
Parallel of altitude
Approximate altitude
Rational horizon
_____ is an altitude determined by inexact means either by estimation or star finder.
Approximate altitude
Azimuth angle
Co-latitude
Prime vertical
_____ is a great circle on the celstial sphere formed by extending a horizontal plane parallel to the sensible horizon.
Rational horizon
Altitude
Approximate altitude
Parallel of altitude
_____ is the arc of the horizon or the angle at the zenith between the prime vertical and the vertical through the body.
Azimuth angle
Co-latitude
Prime vertical
Intercept
_____ is the semi-great circle which connects the Zenith and the Nadir.
Prime Vertical
Approximate altitude
Rational horizon
Parallel of altitude
_____ is the arc of the horizon or the angle of the Zenith between the prime vertical and the vertical circle through the body.
Amplitude
Altitude
Azimuth angle
Approximate altitude
_____ is the side PZ in the navigational triangle.
Co-latitude
Zenith distance
Amplitude
Rational horizon
_____ is the difference in altitude at assumed and actual position, and also the difference in radii of circles of equal altitude at two places.
Intercept
Rational horizon
Altitude
Approximate altitude
_____ is a great circle of celestial sphere whose plane is at right angle to the observer’s meridian and which passes through the zenith and nadir and through E and W points of the horizon.
Prime vertical
Amplitude
Rational horizon
Parallel of altitude
_____ is the radius of a circle of equal altitude of a body.
True altitude
Prime Vertical
Azimuth angle
Zenith distance
_____ is the arc of the vertical circle contained between the body and the horizon.
True altitude
Rational horizon
Parallel of altitude
Prime Vertical
_____ is the direction of a line drawn from the observer’s assume position towards the geographical position of a celestial body, when plotting an LOP.
Azimuth
Co-latitude
Intercept
Parallel of altitude
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